Round Timber Print E-mail
In days gone by, predictions of strength and performance of round timbers were based on experience and a fair bit of guesswork. The predictions of strength tended to be on the conservative side where structural integrity was important. In those days, large sizes were readily available and so the largest size that could be maneuvered into position with the equipment available on the job, tended to be used. Since then we have progressively increased our knowledge of the strength and durability of the different timber species through research and testing.

Uses of round timber include poles, piles, girders and posts. Predictions of strength and performance are usually based on visual grading (which relies in part on the strength group of the species) and the durability rating of the species. See: Natural Durability Ratings.

Round timber products are available as:

Natural round hardwood (Treated and untreated) The only real processing of the product apart from any preservative treatment is the removal of any limbs that may be present. The sapwood is not removed. The sapwood of all species is non-durable because of its life-supporting starches and sugars, therefore, for timber exposed to the weather or in ground contact, the sapwood is normally either removed or preservative treated. See: Treated Timber.

Where the product is not exposed to the weather or in ground contact but the sapwood is susceptible to Lyctid borer, the sapwood should be either removed or treated to prevent Lyctid borer attack. See: Natural Durability Ratings.

Desapped hardwood Processing of the product involves the removal of any limbs that may be present and the removal of all of the sapwood.

Natural round softwood Processing of the product involves the removal of any limbs that may be present and preservative treatment to one of a number of Hazard levels. See: Treated Timber. Preservative treatment is necessary because most of the softwoods commercially available for round timbers have a low durability rating. See: Natural Durability Ratings. Round timber products are usually graded to an Australian Standard for the products required such as poles, piles, girders, corbels, house stumps and so on. "F grades" can be determined when required.

 
Advertisement

Advertisement

Advertisement